Rotary well drill



Feb. 17, 1925 1,526 677 R. A. PAINTER ROTARY WELL DRILL Filed Au 1s 19 42 Sheets-Sheet 1 gym van 0'0 .1205 863 C:

2 $heets-Sheet 2 7 c A w 4 A H 4 l r A III llllill R. A. PAINTER FiledAug. 16. 1924 Patented Feb. 17,1925.

OFFICE- RocBnnT A. PAINTER, or rem: WORTH, TEXAS.

ROTARY -WELL DRILL.

Application filed August 16, 1924. Serial No. 732,559,

To'aZZ whom it concern:

Be it known that I, ROBERT A. PAINTER, a-

' citizen of the United States, residing at Fort Worth, in the county ofTarrant and State of Texas, have invented certain new and usefulImprovements in Rotary Well Drills, of which the following is aspecification, reference being had to the accompanying drawings.

- the well drill shown in the Patent #1,224,

This invention relates to rotary well drills and more particularly to animprovement of I 509 issued under date of May 1,- 1917to T.

B. Smith.

Animportant and more specific object of the invention is an improvementin-the manher of attaching bits to the drill shoe or casing for thepurpose of rendering this attachment more facile.

A furtherobject of the invention is to pro- .vide an improvement of thegeneral struc- "ture of the drill as illustrated in this patent,particularly in the addition of means for reaming the'bore formed by thecutter bits so that it is the of casing.

proper size for the reception These and other objects I attain by theconstruction shown in the accompanying drawings, wherein for the purposeof illustration is showna preferred embodiment of my invention andwherein Figure l'is a side elevation of rotary drilling mechanismconstructed in accordance with my invention; 1

Figure 2 is a bottom plan view thereof;

Figure 3 is a perspective of the valve car- Tying member of the coretaking apparatus;

Figure 4;

F1gure t is a vertical sectional view through the lower end of thedrill;

Figure 5 is a similar view of the upper Figure 6 is a section on theline 66 of section of the drill;

Fi re 7 is a combined perspective showing t e upper end of the lockingsleeve and the associated locking elements for the sleeve.

Referrin now more particularly to the drawings,'t e numeral 10 generallyindicates a drill shoe adapted for attachment to a drill pipe 11 bymeans of which the shoe is rotated. The shoe is formed in'upper andlower sections 12 and 13, the lower section being provided with athreaded socket 14 of a size toreceive the drill'pipe directly e uppersection 12 having a pin 15 for engagement in this socket. The lowersection ad3acent the lower end thereof is enlarged, as at 16, toreinforce the same. The sections 12 and 13 have bores 17 and 18, thebore 18 being smaller than the-bore 17.

The upper end of the reduced bore 18 is provided with screw-threads forthe reccp: tion of a core barrel 19 which extends into the bore 17 andis concentrically spaced therefrom. The lower end of the bore 'islikewise interiorly threaded to receive the exteriorly threaded reducedupper end 20 of a sleeve 21. The reduction of the sleeve 21 is u on theexterior thereof, so that the shou der 22 is formed upon the sleeveabutting the under surface of the lower end of the section 13 limitingthe upward movement of the sleeve. The upper end of this sleeve isprovided at diametrically opposed points with pairs of cars 23 to whichare pivoted valve plates 24. The adj acentedges of these valve platesare spaced from each other and bevele downwardly, as indicated at 25,each ,of these edges being provided centrally with a V-shaped notch orrecess 26. These plates normally extend transversely of the upper end ofthe sleeve which limits their downward movement at this point, but mayswing upwardly so as to permit the passage upwardly through the bore 18of the core barrel as hereinafter more fully set forth. The interior ofthis core barrel is preferably lined with a removable sleeve 27, thepurpose ofwhich will presently appear, the upper end of this sleeveabutting the lower end of-the core barrel 19 and the sleeve having abore 28 of the same mm; as the bore of the core barrel.

The thickened portion 16 of the shoe is provided in its'periphery withdiametrically opposed longitudinally extending. grooves or channels 29,the base walls of which are convex and curving in concentric rclationtothe bore 18 as more clearly shown in Figure 6. The lower ends of thesegrooves open through the bottom of the section 13 and their upper endsare provided with inwardly directed coves 30. The drill bits for use inconnection with the -shoe are each provided with a shank 31 fitting intoand conforming exactly to the shaping of the groove 29 and its cove 30,the outer surfaces of these shanks roviding a continuation of the outersurcc of the enlarged portion 16 of the shoe.

The bits 32 attached to theshanks may be of varied forms but in eachconstruction will have the stem attached to the bit at a point spacedslightly inwardlv from the outer edge of the bit, thus providing anupwardly i'ac ing shoulder 33 and'inwardly from the bit providing anupwardly facing shoulder 34. The shoulder 34 abuts against the undersurface of the section '13 when the bit is in applied position. Theinner edges of the bits are notched, as at 35, to receive the enlargedportions of the sleeve 21, the notch providing an upwardly directedshoulder 36 against which the lower end of the sleeve rests to therebyprevent accidental disen gagement of the sleeve.

As a means for retaining the bit shanks in position, I provide aretaining sleeve 37 closely fitting the exterior of the enlarged portion16 and section 13. In this enlarged portion I provide a plurality ofsockets 38, the outer ends of which are enlarged and screw-threaded asat 39. In this socket is seated a locking stem 40 having secured theretoa collar 41, between which collars and the inner ends of the boressprings 42 extend normally urging the locking stems outwardly. Theoutward movement of the lockingstems is limited by a perforated plug 43through which the locking stem may extend, but through which the collar41 will not pziss. The sleeve is provided with a plurality of openings44, these openings corresponding in number and arrangement to thesockets and into these openings the outer ends of the locking stemsextend'when the sleeve is in applied position, preventing movement ofthe sleeve upon the enlargement 16. Vhen it is desired to change thebits, these stems are forced inwardly by a tool, such as illustrated,comprising a body 45 having areduced end portion 46 of less' size thanthe openings 44 and of the same length as the thickness of the sleeve.The body 45 is of too great size to enter the openings 44 andaccordingly the extensions will simply shift the locking stems inwardlyuntil they clear the sleeve to permit a primary movement thereof. Aftersuch primary movement, where the; openings are thrown out of alignmentwith the pins, the sleeve may, of course, be shifted to any desiredpoint. After the sleeve has been elevated to clear the upper ends of theshanks, the pins will spring outwardly beneath the lower end of thesleeve, preventing accidental downward movement ofthe sleeve, which in atool of the size ordinarily used in drillshanks being held in positionby pins 50 illw serted in the bores 48 and extending into notches 51formed in the shanks 48 of the reamer cutters. It will, of course, be.obvious that the particular type of bit or reamer cutter employed iscapable-llof a considerable range of change and moeification.

as is likewise the general detail structure at the tool as abovedescribed, and I accord ingly do not limit myself to such specificstructure as hereinbefore set forth except as hereinafter claimed.

I claim:

1. In combined drilling and coring apparatus, a drill bit carrying shoehaving a longitudinal bore, bits carried by the shoe, a core barrelarranged within the bore, a sleeve threaded'in thelower end of the bore,means carried by the sleeve and adapted to sever and support a core on apredetermined movement of the barrel, means for locking the bits inposition in the shoe, and shoulders formed on said bits extendingbenbath the lower end of the sleeve to prevent downward movementthereof.

2. In combined drilling and coring apparatus, a drill bit carrying shoehaving a longitudinal bore, bits carried by the shoe, a core barrelarranged within the bore, a sleeve threaded in the lower end of thebore, shiftable valves carried by the sleeve and adapted to sever andsupport a core on a predetermined movement of the barrel, means forlocking the bits in position in the shoe, shoulders formed on said bitsextend- ROBERT A. PAINTER.

